A friend of mine who is gay sent me a letter anonymously telling me about his struggles being gay.  His life is difficult because of his feelings towards the same sex.  Despite this he managed to get married to a woman and he ignores his feelings for the same sex and tries to live life as a good Muslim. He does not act on his urges and feels that Allah will forgive him for whatever feelings he has in his heart.
Now, I presume God knew what he was doing when he made people gay.  Clearly this guy did not choose to be gay, and clearly none of us choose to be straight.  If Islam (and Christianity and Judaism) are from God, why would God do such a cruel thing of making people gay and then making them suffer by saying they cannot act on their feelings.  If homosexuality is a private matter and does not hurt anyone, why does God need to forbid it.  If its so horrible, why are people born this way?  Rather it’s a natural thing that among the variety of people, sometimes people are born gay.   Sometimes people are even born with both male and female sexual organs.  It happens.  These people deserve to live happy lives just like us straight people do.

As far as we know there is no way to cure ‘gayness’.  No known method – shock treatment or otherwise seems to work.

The fact that the American Psychological Manual DSM-IV used to classify it as a mental disorder but no longer shows that we have learned from our errors.   You cant pick and choose and say “look it was a disorder” but ignore the fact that science makes progress over time and we know better now.